JPH06146795A - Joint of segment - Google Patents

Abstract

PURPOSE:To provide such an economic joint of segments as having a high working efficiency and strength. CONSTITUTION:A joint of segments is constituted of a pipe-like body having a female screw 19 on the inner side thereof, and an insert pipe 16 mounting and fixing an anchor plate 18 to the front end part thereof is buried in a concrete structural body 12 in advance. A mounting member 11 is fixed and mounted to the concrete structural body 12 by screwing a bolt 21 in the buried insert pipe 16 from the mounting member 11 side. For that purpose, such a joint of segments as having excellent strength with a simple manufacturing method can be embodied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a segment for tunnel lining, and more particularly to a joint for a segment which is easy to manufacture and can be procured at low cost.

[0002]

2. Description of the Related Art In a tunnel construction site, as a standard type of joint for connecting tunnel lining segments, as shown in FIG. There is a metal fitting straight bolt type joint in which metal fittings 32 and 33 having screw through holes are attached in advance and bolts 34 and nuts 35 are tightened and coupled to the metal fittings 32 and 33.

Another conventional example is the insert type shown in FIG. The joint of this segment for tunnel lining is a type of joint called a long bolt type, in which a flange 2 of the segment 1 is provided with a through hole 3, and a sheath pipe 4 made of an internally threaded pipe is placed in the through hole 3 by concrete casting. Before being installed, it is embedded in advance, and in the flange 6 of the segment 5, an insert nut 8 having an internal thread 9 formed on the inner surface is embedded, which is composed of a tubular body having an anchor 7 attached to the tip thereof. The bolts 10 are inserted into the sheath tube 4 from the opening side of the sheath tube 4 and screwed into the insert nut 8 so as to be tightened and fixed, thereby joining the segment 1 and the segment 5 together.
The anchor 7 is composed of an elongated leg member, and is provided so as to spread radially outward from the outer surface of the insert nut 8. Therefore, the insert nut 8 is prevented from falling out in the concrete segment 5. Further, the segments 1 and 5 as described above are arranged in the length direction and the circumferential direction of the tunnel, and the tunnel lining work is performed by connecting the respective segments with the bolt 10 and the insert nut 8.

[0004]

However, in such a conventional joint for joining the segments for tunnel lining, the insert nut 8 is manufactured and then the anchor 7 is welded to the insert nut 8. It has to be attached by a method, which increases the number of manufacturing steps and is expensive. Further, since the anchor 7 is composed of the leg members, there is a problem that the proof stress as the joint of the segment is not sufficient.

The present invention has been made in view of the above problems, and an object thereof is to provide an economical joint for a segment which has good workability and large yield strength.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an insert pipe, which is composed of a tubular body having an internal thread formed on its inner surface, and has an anchor member attached and fixed to the tip end thereof in a concrete structure. The gist is that the mounting member is fixedly attached to the concrete structure by preliminarily embedding it into the concrete structure and screwing a bolt into the embedded insert pipe.

[0007]

With the above construction, the insert pipe is manufactured by threading the inner surface of the pipe on the bolt inlet side. The insert pipe is also threaded on the side opposite to the bolt inlet side, and the anchor member is attached thereto. Then, an insert pipe with an anchor member attached is embedded in one concrete segment, a sheath pipe is embedded in the other segment, and both segments are joined so that the insert pipe and the sheath pipe communicate with each other. Then insert the bolt from the sheath side and screw it into the internal thread in the insert tube to join the two segments.

[0008]

1 to 3 are views showing an embodiment of a joint for a segment according to the present invention. Of these, FIG. 1 is a cross-sectional view showing the overall structure of the joint, and FIGS. 2 and 3 are cross-sectional views showing the relationship between the bolt screwed into the insert pipe of the joint and the female screw portion.

In FIG. 1, reference numeral 11 is a first segment as a mounting member, and 12 is this first segment 11.
Is a second segment, 13 is a sheath formed by forming a through hole 15 in the flange 14 of the first segment 11 and cutting an internal screw 13a installed in the through hole 15, and 16 is a second pipe. An insert pipe embedded in the flange 17 of the segment 12 and an anchor plate 18 as an example of an anchor member attached and fixed to the tip of the insert pipe 16. The insert pipe 16 is formed of a tubular body and has an internal thread 19 formed on the inner side surface on the bolt inlet side, while an internal thread 20 is formed on the inner side surface opposite to the bolt inlet side. As the anchor member, in addition to the anchor plate 18, a member having an anchor function such as one in which the tip of the insert tube is integrally formed with a dish cover is considered.

Further, reference numeral 21 is a long bolt in which the roots and peaks of the screws are flat, which are first screw-fed in an engagement state with the inner screw 13a with a margin, and then screwed into the female screw 19 in a close-contact state. And the second segment 11, 12
To join. Reference numeral 22 is a rod-shaped bolt screwed into the female screw 20 to attach the anchor plate 18 to the insert pipe 16, and 23 is a nut that is screwed to the rod-shaped bolt 22 to attach and fix the anchor plate 18 to the insert pipe 16. The long bolt 21 is composed of a screw-rod reinforcing bar. The female thread 19 into which the long bolt 21 is screwed has a reference valley width P whose valley width P matches the thread formed on the long bolt 21 as shown in FIG.
1, the width is slightly wider on the side of the bolt inlet, that is, P> P1, while in the area b far from the bolt inlet, the valley width P becomes the reference valley width P1 as shown in FIG. They are formed so as to have equal dimensions, that is, P = P1.

The operation of the segment joint having the above structure will be described below. First, in manufacturing the first and second segments 11 and 12, the first segment 11 is manufactured by placing concrete in a state in which the sheath pipe 15 in which the inner screw 13a is cut is embedded. On the other hand, for the second segment 12, the insert pipe 1
A rod-shaped bolt 22 is screwed into the tip portion of 6, and the anchor plate 18 is inserted into the rod-shaped bolt 22 to insert a nut 23.
And tighten the anchor plate 18 with the insert pipe 16
Attach and fix to. The anchor plate 18 may be attached to the tip portion of the insert tube 16 by welding. The anchor plate 18 is the insert pipe 16
Since the anchor plate 18 is formed to have a larger diameter, the anchor plate 18 has a flange structure at the tip portion of the insert pipe 16 and projects outward in the radial direction. Then, the insert pipe 16 is embedded with the anchor plate 18 attached, and concrete is poured to manufacture the second segment 12. Within the second segment 12,
Since the anchor plate 18 has a flange structure at the tip portion of the insert pipe 16 and projects outward in the radial direction, the insert pipe 16 resists the pulling force in the second segment 12 made of concrete.

The first and second segments 11 and 12 as described above are arranged in the lengthwise direction and the circumferential direction of the tunnel. Then, with the two segments 11 and 12 joined together, the long bolt 21 is inserted from the opening side of the sheath tube 15.
Is screwed into the screw-in insert pipe 16 and tightened and fixed, and the first segment 11 and the second segment 12 are
Combine with. When the long bolt 21 is screwed into the insert pipe 16, the long bolt 21 engages with the internal thread 19. However, as described above, the internal thread 19 has a valley width P in the area a near the bolt inlet. P is formed to have a slightly wider dimension on the bolt inlet side than the reference valley width P1 that matches the thread formed on the long bolt 21, that is, P> P1, while the area b far from the bolt inlet. Since the valley width P is formed so as to be equal to the reference valley width P1, that is, P = P1, the long bolt 21
Engages with the internal thread 19 in a region b substantially remote from the bolt inlet and exerts a tightening action in this region b.

Then, the first and second segments 1
When external force is applied between the segments 11 and 12 after the bolts 1 and 12 are bolted and a pull-out force is applied between the long bolt 21 and the insert pipe 16, the force from the long bolt 21 is the same as that of the insert pipe 16. Act on the position of. For this reason, in the flange 17 of the second segment 12, from the position which goes into the back from the concrete free surface, the reference sign S in FIG.
A large funnel-shaped shear surface is generated as indicated by, and the proof stress of the joint is increased. Because it is supported by this large bearing capacity
The connection between the second segments 11 and 12 is stable, and a more reliable tunnel lining work is performed.

[0014]

As described above, according to the present invention,
The concrete structure is composed of a tubular body having an internal thread formed on the inner surface thereof, and an insert pipe having an anchor member attached and fixed to the tip portion thereof is previously embedded in the concrete structure, and a bolt is screwed into the embedded insert pipe. Since the mounting member is fixedly attached to
The effect is that a segment joint that is easy to manufacture and that has excellent proof stress can be realized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a connected state of a joint of a segment according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of a screw formed in a region near the bolt inlet of the insert tube in the embodiment.

FIG. 3 is a cross-sectional view showing a structure of a screw formed in a region far from a bolt inlet of the insert tube in the embodiment.

FIG. 4 is a cross-sectional view showing a configuration example of a standard type among conventional segment joints.

FIG. 5 is a cross-sectional view showing an example of an insert-type segment joint of conventional segment joints.

[Explanation of Codes] 11 First segment 12 Second segment 14, 17 Flange 13 Sheath tube 16 Insert tube 18 Anchor plate (anchor member) 19, 20 Female thread 21 Long bolt 22 Bar bolt 23 Nut

Claims (5)

[Claims] 1. An insert pipe comprising a bolt and a tubular body having an inlet for the bolt and having an internal thread formed from the inlet side of the bolt toward the inner side of the insert pipe, and the insert pipe on the opposite side of the bolt inlet side of the insert pipe. It consists of an anchor member attached and fixed to the end part, and the insert pipe is embedded in the concrete structure in advance with the anchor member attached to the insert pipe, and the bolt is screwed into the embedded insert pipe from the attachment member side. According to the above, the joint of the segment is characterized in that the attachment member is fixedly attached to the concrete structure. 2. The insert pipe is formed with an internal thread from an end portion on the inlet side of the bolt and an end portion on the opposite side of the bolt. The bolt is screwed into the screw portion at the opposite end portion so that the anchor member is attached. 2. The segment joint according to claim 1, wherein the joint is fixedly mounted. 3. The joint of the segment according to claim 1, wherein an anchor member is welded and fixed to an end portion of the insert pipe opposite to the inlet side of the bolt. 4. The screw, which is formed on the bolt inlet side of the insert pipe, is formed such that the valley width in the area near the bolt inlet is wider on the bolt inlet side than the reference valley width. 4. The segment joint according to claim 1, wherein the valley width is formed to have a size equal to the reference valley width in a region far from the inlet. 5. The mounting member is previously embedded with a sheath pipe facing the insert pipe, and an internal thread is formed in the sheath pipe. Segment fittings.